Every few months I become dissatisfied and reposition my speakers. Separation, toe in, distance to walls, etc. And, lo, the heavens open up and I can hear angels singing. After a few months i do it again with similar epiphanic results. Finally, a year goes by, and I’m back to the same position I started from—and the cycle continues.
Our ear to brain interface is anything but fixed & static
This why some days our systems sound more or less amazing to us.
Your response to refreshing speaker placement, is exactly the opposite of the ever controversial subject of “break-in” - where the longer we listen & acclimatize to something, the more amazing it becomes.
Could be your setup has a myriad of room response effects & changing things up simply swaps one compromise for another bennie.